What to tell the children?

My 9-year-old son on Friday saw that the Zoe 101 girl who says she is 16 announced her pregnancy.
I said she ought to be ashamed. Take into account that I'm talking to a 9-year-old.
I know that girl has more than enough money and support from her family to do as she pleases. When you do on your own dime, you are grown and can do as you please. She can become emancipated and live her life as an adult legally if she chooses to do so. She is grown--even at 16.
However, my little boy is a child. He didn't seem to see anything wrong with what Ms. Spears was doing. He thinks he is grown anyway so I let him know the whatfor.
"When you are old enough to have sex you are also old enough to pay your own bills and have a place of your own in which to have said sex."
I also told him if you are old enough to have a baby you are old enough to care for said baby. I'm not going to do it.
He was astonished.
"All I did was ask what was wrong with it!"
He finished putting on his school clothes and went on about his day as a child.
But now, at least he knows.